Failed Emissions... Again!: - Jeep Wrangler Forum
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > YJ Jeep Wrangler Forum > YJ Tech Forum

Join Wrangler Forum Today


Reply
 
Thread Tools

Please support our sponsors and let them know you heard about them on WranglerForum.com
Old 10-03-2012, 08:20 PM   #1
Jeeper
 
Defcon 1's Avatar
 
Join Date: Jun 2012
Location: South New Jersey
Posts: 716
Failed Emissions... Again!:

What causes the CO (carbon monoxide) to be higher in your exhaust? I failed state inspection again for the same reason after reconnecting my O2 sensor and repairing a crack in the head-pipe.

I don't just wanna shot-gun parts, but is there anyway I can isolate what's wrong without getting too expensive? I'm leaning towards a bad O2 sensor, b/c my CAT is only 4 years old at this point, 2 of which it sat in the garage. I don't think it's a clogged fuel injector b/c I change my fuel filters often and always use injector cleaner at every 3,000 mile oil change.

Any thoughts / suggestions? Everything else is well within range, but the CO is several times the allowed limit. I'm not happy at all b/c now I can't drive my Jeep anywhere until I get it fixed

Defcon 1 is offline   Quote Quick Reply
Old 10-03-2012, 08:49 PM   #2
Jeeper
 
cakes567's Avatar
 
Join Date: Feb 2012
Location: NY
Posts: 1,496
Images: 8
Send a message via AIM to cakes567
Have you ran any cat cleaner threw it? A lot of todays cheaper fuels will clog up your cats real bad. That's what happened to the truck. Would fail emissions but ran cat cleaner threw like one or 2 tanks and it passed. And also id try an o2 sensor. Not to expensive don't have much to lose. I think I got one for like 30 bucks at advanced auto or something close to that

__________________
-Melvin Friendly-
cakes567 is offline   Quote Quick Reply
Old 10-03-2012, 09:25 PM   #3
Jeeper
 
Join Date: Jul 2012
Posts: 175
CO comes from rich mixtures which points to the O2 sensor or possibly a temperature sensor that is telling the engine ECU that the engine is cold, when it is not. It would help to know what model year and engine you have and all of the actual emission test numbers.

Typically if the engine is running rich and the cat is working you get a lot of temperature rise in the catalyst because it is trying to burn the excess fuel. I don't know about Jeep's specifically but there are a lot of car fires started due to this condition.
WICruiser is offline   Quote Quick Reply
Old 10-03-2012, 11:35 PM   #4
jokerchief462

WF Supporting Member
 
jokerchief462's Avatar
 
Join Date: Apr 2012
Location: North Las Vegas
Posts: 9,275
Some info for you might help isolate it down some.
Failed Emissions Test. My car failed the emissions test - SmogTips.com.
jokerchief462 is offline   Quote Quick Reply
Old 10-04-2012, 03:22 AM   #5
Jeeper
 
Defcon 1's Avatar
 
Join Date: Jun 2012
Location: South New Jersey
Posts: 716
Well I can't add any cleaners to my tank now that I can't drive the Jeep, it would take forever to burn threw 2 tanks of gas at idle lol. I will look into the O2 sensor furthermore, it is a few years old but I'll start there. Thanks for the troubleshooting guide Joker, that's some really good info. I've had the Jeep now for 10 years and I never replaced the MAP sensor, so maybe I'll toss one of them in too and see what happens.
Defcon 1 is offline   Quote Quick Reply
Old 10-04-2012, 10:34 AM   #6
Jeeper
 
Join Date: Oct 2012
Posts: 15
move to florida
bigred119 is offline   Quote Quick Reply
Old 10-04-2012, 11:25 AM   #7
Jeeper
 
Surfinglbi23's Avatar
 
Join Date: Nov 2009
Location: Haddonfield, NJ
Posts: 275
Were you overdue for inspection when you failed? Because if not, you have till the last day of the month on your sticker. I am guessing since you posted yesterday, you probably expire in October? If so, you have a little while, maybe 3 weeks to run a few tanks through the Jeep. Get some cleaners in there and hope for the best before you toss money at it.
__________________
1995 Wrangler 2.5
2006 Lexus RX330
2007 KTM 300xc
1999 Suzuki DR350
2000 Wrangler Sahara - bought new, now sold
Surfinglbi23 is offline   Quote Quick Reply
Old 10-04-2012, 11:27 AM   #8
Jeeper
 
Smalls1026's Avatar
 
Join Date: Sep 2012
Posts: 56
Check O2 again and check to make sure your manifold gasket isn't leaking (from past experience they don't just test in the pipes but all around vehicle)
Smalls1026 is offline   Quote Quick Reply
Old 10-04-2012, 08:32 PM   #9
Jeeper
 
Defcon 1's Avatar
 
Join Date: Jun 2012
Location: South New Jersey
Posts: 716
Quote:
Originally Posted by Surfinglbi23 View Post
Were you overdue for inspection when you failed? Because if not, you have till the last day of the month on your sticker. I am guessing since you posted yesterday, you probably expire in October? If so, you have a little while, maybe 3 weeks to run a few tanks through the Jeep. Get some cleaners in there and hope for the best before you toss money at it.
My Jeep sat for 2 years while I was working on it so it was 2 years overdue lol. When I got it re-registered, I had 2 weeks to get it inspected. I failed the 1st time and got till the end of the month, (September). Failed again so now I can't drive anywhere without getting pulled over, they said "You have to be driving to the inspection station or a repair facility, that's it." So I'm kinda beat for driving around burning a cleaner in my fuel tank for now.

Quote:
Originally Posted by Smalls1026 View Post
Check O2 again and check to make sure your manifold gasket isn't leaking (from past experience they don't just test in the pipes but all around vehicle)
Since I passed the other areas of inspection, they are just checking the exhaust pipe at the end, they have that probe they lay just behind it. I will 2x check for leaks though.

Defcon 1 is offline   Quote Quick Reply
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Jeep Wrangler Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



logo carid shop wrangler parts carid fender flares custom wheels store avs deflectors at carid
» Rates
Get low rates on auto insurance in Canada!

» Network Links
»Jeep Parts
» Featured Product

All times are GMT -5. The time now is 09:38 PM.



Jeep®, Wrangler, Liberty, Wagoneer, Cherokee, and Grand Cherokee are copyrighted and trademarked to Chrysler Motors LLC.
Wranglerforum.com is not in any way associated with the Chrysler Motors LLC